The Seat,valve, cataloged under National Stock Number 4820-01-541-7287, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-541-7287 |
| Primary Part Number | 803-5001003-X7X1-04CP |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.330 INCHES NOMINAL IN |
| Flange Diameter | 3.557 INCHES NOMINAL IN |
| Body Outside Diameter | 2.557 INCHES NOMINAL IN |
| Criticality Code Justification | ZZZY |
| Body Stepped Inside Diameter | 2.557 INCHES NOMINAL FIRST STEP IN |
| Style Designator | PLAIN FLANGED |
| Body Inside Diameter | 1.500 INCHES NOMINAL IN |
| Under Flange Height | 0.170 INCHES NOMINAL IN |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE OVERALL |
| Seat Angle in Deg | 45.000 NOMINAL |
| Reference Number Differentiating Characteristics | CLEANING, PACKAGING, AND MARKING IAW THE LATEST REVISION OF MIL-STD-1330 |
| Seating Surface Shape | ANGULAR |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 803-5001003-X7X1-04CP | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 5001003 | D/9 Drawing number reference only Naval Sea Systems Command |
| 803-5001003-X7XX-04 | 5/1 Secondary reference Naval Sea Systems Command |
| 803-5001003-X7X1-04 | 3/1 Design control — primary reference Naval Sea Systems Command |
NSN 4820-01-541-7287 is a Seat,valve, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-541-7287 has 1 manufacturer part number on file: 803-5001003-X7X1-04CP (Naval Inventory Control Point Mechanicsburg).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-566-8866. Verify interchangeability with system specifications before substitution.
Key specifications for 803-5001003-X7X1-04CP: Flange Seat to Disk End Height: 0.330 INCHES NOMINAL IN; Flange Diameter: 3.557 INCHES NOMINAL IN; Overall Height: 0.330 INCHES NOMINAL IN; Body Outside Diameter: 2.557 INCHES NOMINAL IN. 12 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.